How to create a sphere with an outer layer of removable pieces?
You could create your icosphere, duplicate it with ShiftD, select one of the two, go in Edit mode, select all and split the faces (Mesh &gt; Split &gt; Faces by Edges):

Then extrude with E, press Enter right away, and scale up with Transform Pivot Point &gt; Median Point selected:

Now you have your two objects, the core and the outer sphere. You can separate each piece of the outer sphere with P &gt; By Loose Parts:

Each of these separate pieces will have the same origin, which I guess will help to position them correctly in the 3D space of your game.